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Finding the Fourth Proportional to 78,481.71, 108,346.14 and 62,999.78

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Solution

The fourth proportional to 78,481.71, 108,346.14 and 62,999.78 is: 86,972.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,481.71 : 108,346.14 = 62,999.78 : x
  2. Step 2: Convert to fraction form
    78,481.71/108,346.14 = 62,999.78/x
  3. Step 3: Cross multiply
    78,481.71x = 108,346.14 × 62,999.78
  4. Step 4: Simplify right side
    78,481.71x = 6,825,782,442.12
  5. Step 5: Solve for x
    x = 6,825,782,442.12/78,481.71
  6. Step 6: Final answer
    x = 86,972.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.